MBRP Exhaust MBRP 4-Inch Cat-Back Exhaust Tour Profile Single Side Exit 01-04 GM 6.6L Duramax LB7
Fits 2001-2004 6.6L Duramax V8 (LB7) · 6.6L Duramax V8 (LLY)
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A cat-back exhaust replaces the pipes and muffler from the catalytic converter to the tip. It changes how the truck sounds and drops a little weight. This one is the MBRP Exhaust MBRP 4-Inch Cat-Back Exhaust Tour Profile Single Side Exit 01-04 GM 6.6L Duramax LB7, listed to fit the 2001-2004 GMC Sierra 2500HD/3500HD with the 6.6L Duramax V8 (LB7) or 6.6L Duramax V8 (LLY).
why this one — Cat-backs are a sound and looks upgrade first. Treat any power claim as unproven unless the maker publishes a dyno sheet. Diesel Power Products lists it at $664.99, and the fitment above is what the listing itself states, not a guess.
No horsepower or torque figure published by MBRP Exhaust for this part on the Diesel Power Products listing, read 2026-09-04. Not estimated.
Questions about this category
No published gain figure for this part, and nothing here is a guarantee. Price is a list price and can lag the retailer; confirm at checkout. See our affiliate disclosure.